. The complete aquarium book; the care and breeding of goldfish and tropical fishes. Aquariums; Goldfish. CONSTRUCTION 115 The third type of pool has concrete vertical sides, and may be used either at ground level or above. Diagram is self-explanatory with the exception of one point. Tropical water lilies should have the crown and. CONCRETE^ Fig. 92. Strongly Constructed Concrete Pool Straight sides have some advantages, especially when fishes must be caught in a net. Tender water lilies raise their flowers above the water, which should not be deep. soil about 8 to 10 inches below the surface
. The complete aquarium book; the care and breeding of goldfish and tropical fishes. Aquariums; Goldfish. CONSTRUCTION 115 The third type of pool has concrete vertical sides, and may be used either at ground level or above. Diagram is self-explanatory with the exception of one point. Tropical water lilies should have the crown and. CONCRETE^ Fig. 92. Strongly Constructed Concrete Pool Straight sides have some advantages, especially when fishes must be caught in a net. Tender water lilies raise their flowers above the water, which should not be deep. soil about 8 to 10 inches below the surface of the water. The tub only needs to be raised on stones as shown if necessary to make this adjust- ment. Reinforcement is required if anything more than a light frost is possible. Extra reinforcement at all corners is advisable. While giving advice we could well add the suggestion of having the assistance of an experienced concrete worker, or at least a helper with strong arms and back! The base of this pool should be about 6 inches thick and the walls about 5 inches. A slight outward slope to the walls is desirable. It is important that concrete work dry slowly. Protect from the sun with litter. Sprinkle if necessary. Forms may be removed in two days. Finishing coat follows immediately. All concrete pools should have at least six changes of water over a period of two weeks before introducing fishes or plants. This is important. We have seen many amateur-built concrete pools which were off level. This is indeed a sad defect to discover when the first filling with water nears the top. To avoid this embarrassment, attach a good spirit- level to the narrow edge of an ordinary straight board long enough to reach diagonally across corners of pool. Test it between two fixed points that will bring the bubble in the center. Turn board around so that reverse ends will rest on the same points again. If bubble again settles. Please note that these images are extracted from scanned page im
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